Gemstone



FIG. 1 is a perspective view of a gemstone showing my new design;

FIG. 2 is a top view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a left side view thereof, the opposite side view being a mirror image thereof; and,

FIG. 6 is a bottom view thereof. 

CLAIM I claim, the ornamental design for a gemstone, as shown and described. 